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Input: cap11xx - add LED support
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Several cap11xx variants have LEDs that be can be controlled; let's plug
the driver into the LED subsystem.

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Matt Ranostay authored and Dmitry Torokhov committed Aug 17, 2015
1 parent 7229b87 commit efe3b61
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Showing 2 changed files with 160 additions and 3 deletions.
19 changes: 19 additions & 0 deletions Documentation/devicetree/bindings/input/cap11xx.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -55,5 +55,24 @@ i2c_controller {
<105>, /* KEY_LEFT */
<109>, /* KEY_PAGEDOWN */
<104>; /* KEY_PAGEUP */

#address-cells = <1>;
#size-cells = <0>;

usr@0 {
label = "cap11xx:green:usr0";
reg = <0>;
};

usr@1 {
label = "cap11xx:green:usr1";
reg = <1>;
};

alive@2 {
label = "cap11xx:green:alive";
reg = <2>;
linux,default_trigger = "heartbeat";
};
};
}
144 changes: 141 additions & 3 deletions drivers/input/keyboard/cap11xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/of_irq.h>
#include <linux/regmap.h>
#include <linux/i2c.h>
Expand Down Expand Up @@ -47,6 +48,20 @@
#define CAP11XX_REG_CONFIG2 0x44
#define CAP11XX_REG_CONFIG2_ALT_POL BIT(6)
#define CAP11XX_REG_SENSOR_BASE_CNT(X) (0x50 + (X))
#define CAP11XX_REG_LED_POLARITY 0x73
#define CAP11XX_REG_LED_OUTPUT_CONTROL 0x74

#define CAP11XX_REG_LED_DUTY_CYCLE_1 0x90
#define CAP11XX_REG_LED_DUTY_CYCLE_2 0x91
#define CAP11XX_REG_LED_DUTY_CYCLE_3 0x92
#define CAP11XX_REG_LED_DUTY_CYCLE_4 0x93

#define CAP11XX_REG_LED_DUTY_MIN_MASK (0x0f)
#define CAP11XX_REG_LED_DUTY_MIN_MASK_SHIFT (0)
#define CAP11XX_REG_LED_DUTY_MAX_MASK (0xf0)
#define CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT (4)
#define CAP11XX_REG_LED_DUTY_MAX_VALUE (15)

#define CAP11XX_REG_SENSOR_CALIB (0xb1 + (X))
#define CAP11XX_REG_SENSOR_CALIB_LSB1 0xb9
#define CAP11XX_REG_SENSOR_CALIB_LSB2 0xba
Expand All @@ -56,17 +71,31 @@

#define CAP11XX_MANUFACTURER_ID 0x5d

#ifdef CONFIG_LEDS_CLASS
struct cap11xx_led {
struct cap11xx_priv *priv;
struct led_classdev cdev;
struct work_struct work;
u32 reg;
enum led_brightness new_brightness;
};
#endif

struct cap11xx_priv {
struct regmap *regmap;
struct input_dev *idev;

struct cap11xx_led *leds;
int num_leds;

/* config */
u32 keycodes[];
};

struct cap11xx_hw_model {
u8 product_id;
unsigned int num_channels;
unsigned int num_leds;
};

enum {
Expand All @@ -76,9 +105,9 @@ enum {
};

static const struct cap11xx_hw_model cap11xx_devices[] = {
[CAP1106] = { .product_id = 0x55, .num_channels = 6 },
[CAP1126] = { .product_id = 0x53, .num_channels = 6 },
[CAP1188] = { .product_id = 0x50, .num_channels = 8 },
[CAP1106] = { .product_id = 0x55, .num_channels = 6, .num_leds = 0 },
[CAP1126] = { .product_id = 0x53, .num_channels = 6, .num_leds = 2 },
[CAP1188] = { .product_id = 0x50, .num_channels = 8, .num_leds = 8 },
};

static const struct reg_default cap11xx_reg_defaults[] = {
Expand Down Expand Up @@ -111,6 +140,7 @@ static const struct reg_default cap11xx_reg_defaults[] = {
{ CAP11XX_REG_STANDBY_SENSITIVITY, 0x02 },
{ CAP11XX_REG_STANDBY_THRESH, 0x40 },
{ CAP11XX_REG_CONFIG2, 0x40 },
{ CAP11XX_REG_LED_POLARITY, 0x00 },
{ CAP11XX_REG_SENSOR_CALIB_LSB1, 0x00 },
{ CAP11XX_REG_SENSOR_CALIB_LSB2, 0x00 },
};
Expand Down Expand Up @@ -177,6 +207,12 @@ static irqreturn_t cap11xx_thread_func(int irq_num, void *data)

static int cap11xx_set_sleep(struct cap11xx_priv *priv, bool sleep)
{
/*
* DLSEEP mode will turn off all LEDS, prevent this
*/
if (IS_ENABLED(CONFIG_LEDS_CLASS) && priv->num_leds)
return 0;

return regmap_update_bits(priv->regmap, CAP11XX_REG_MAIN_CONTROL,
CAP11XX_REG_MAIN_CONTROL_DLSEEP,
sleep ? CAP11XX_REG_MAIN_CONTROL_DLSEEP : 0);
Expand All @@ -196,6 +232,104 @@ static void cap11xx_input_close(struct input_dev *idev)
cap11xx_set_sleep(priv, true);
}

#ifdef CONFIG_LEDS_CLASS
static void cap11xx_led_work(struct work_struct *work)
{
struct cap11xx_led *led = container_of(work, struct cap11xx_led, work);
struct cap11xx_priv *priv = led->priv;
int value = led->new_brightness;

/*
* All LEDs share the same duty cycle as this is a HW limitation.
* Brightness levels per LED are either 0 (OFF) and 1 (ON).
*/
regmap_update_bits(priv->regmap, CAP11XX_REG_LED_OUTPUT_CONTROL,
BIT(led->reg), value ? BIT(led->reg) : 0);
}

static void cap11xx_led_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct cap11xx_led *led = container_of(cdev, struct cap11xx_led, cdev);

if (led->new_brightness == value)
return;

led->new_brightness = value;
schedule_work(&led->work);
}

static int cap11xx_init_leds(struct device *dev,
struct cap11xx_priv *priv, int num_leds)
{
struct device_node *node = dev->of_node, *child;
struct cap11xx_led *led;
int cnt = of_get_child_count(node);
int error;

if (!num_leds || !cnt)
return 0;

if (cnt > num_leds)
return -EINVAL;

led = devm_kcalloc(dev, cnt, sizeof(struct cap11xx_led), GFP_KERNEL);
if (!led)
return -ENOMEM;

priv->leds = led;

error = regmap_update_bits(priv->regmap,
CAP11XX_REG_LED_OUTPUT_CONTROL, 0xff, 0);
if (error)
return error;

error = regmap_update_bits(priv->regmap, CAP11XX_REG_LED_DUTY_CYCLE_4,
CAP11XX_REG_LED_DUTY_MAX_MASK,
CAP11XX_REG_LED_DUTY_MAX_VALUE <<
CAP11XX_REG_LED_DUTY_MAX_MASK_SHIFT);
if (error)
return error;

for_each_child_of_node(node, child) {
u32 reg;

led->cdev.name =
of_get_property(child, "label", NULL) ? : child->name;
led->cdev.default_trigger =
of_get_property(child, "linux,default-trigger", NULL);
led->cdev.flags = 0;
led->cdev.brightness_set = cap11xx_led_set;
led->cdev.max_brightness = 1;
led->cdev.brightness = LED_OFF;

error = of_property_read_u32(child, "reg", &reg);
if (error != 0 || reg >= num_leds)
return -EINVAL;

led->reg = reg;
led->priv = priv;

INIT_WORK(&led->work, cap11xx_led_work);

error = devm_led_classdev_register(dev, &led->cdev);
if (error)
return error;

priv->num_leds++;
led++;
}

return 0;
}
#else
static int cap11xx_init_leds(struct device *dev,
struct cap11xx_priv *priv, int num_leds)
{
return 0;
}
#endif

static int cap11xx_i2c_probe(struct i2c_client *i2c_client,
const struct i2c_device_id *id)
{
Expand Down Expand Up @@ -316,6 +450,10 @@ static int cap11xx_i2c_probe(struct i2c_client *i2c_client,
priv->idev->open = cap11xx_input_open;
priv->idev->close = cap11xx_input_close;

error = cap11xx_init_leds(dev, priv, cap->num_leds);
if (error)
return error;

input_set_drvdata(priv->idev, priv);

/*
Expand Down

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